3 usage tables, 11 equivalent pipe length for flanges & valves – Roxul Industrial Insulation Process User Manual
Page 167
Item no.
Temperature range in °F
120 to 210
300 to 575
750 to 930
Equivalent length in (ft)
1
Flanges for pressure stages PN 25 to PN 100
1.1
Uninsulated for pipes
1.1.1
In buildings 70 °F
NPS 2
10 - 16
16 - 36
30 - 49
NPS 4
13 - 23
23 - 52
43 - 52
NPS 6
13 - 30
23 - 56
56 - 98
NPS 8
16 - 36
33 - 85
66 - 121
NPS 12
20 - 52
39 - 121
82 - 187
1.1.2
In the open air 32 °F
NPS 2
23 - 36
30 - 52
39 - 62
NPS 4
30 - 46
43 - 75
59 - 92
NPS 6
36 - 59
46 - 95
72 - 121
NPS 8
43 - 79
59 - 125
89 - 151
NPS 12
52 - 105
69 - 177
105 - 226
NPS 16
72 - 102
92 - 174
144 - 223
NPS 20
82 - 105
102 - 171
157 - 226
1.2
Insulated in buildings 70 °F and in the open air 32 °F for pipes
NPS 2
2.3 - 3.3
2.3 - 3.3
3.3 - 3.6
NPS 4
0.3 - 3.3
2.6 - 3.9
3.6 - 4.6
NPS 6
2.6 - 3.6
2.6 - 4.3
4.3 - 5.2
NPS 8
2.6 - 4.3
3 - 4.6
4.3 - 5.6
NPS 12
2.6 - 4.6
3.3 - 5.2
4.6 - 6.2
NPS 16
3.3 - 4.6
3.6 - 5.2
5.2 - 6.2
NPS 20
3.6 - 4.3
3.6 - 5.2
5.2 - 5.9
2
Fittings for pressure stages PN 25 to PN 100
2.1
Uninsulated for pipes
2.1.1
In buildings 70 °F
NPS 2
30 - 49
52 - 95
89 - 128
NPS 4
49 - 69
79 - 151
138 - 207
NPS 6
52 - 92
85 - 207
190 - 295
NPS 8
69 - 115
121 - 269
240 - 354
NPS 12
95 - 167
164 - 381
348 - 581
NPS 16
118 - 197
194 - 446
413 - 676
NPS 20
151 - 249
246 - 558
518 - 876
3.3.11 Equivalent pipe length for flanges & valves
Reference values for plant related thermal bridges (table A14 - VDI 2055)
3.3 Usage tables
164